Telescopic sight for guns



- Seam Ram 33-2469 GR 790171066 5R Oct. 15, 1935. J Q KARNES 2,017,056

TELESCOPIC SIGHT FOR GUNS Filed Oct. 9, 1954 2 Sheets-Sheet l w InventorH Llamas E-Karnes 1 QVWWW Z A t t u r n e y nub 5;.

as @G 335 @EUNitl MEAL Hmmuwam mu Get. 15, 1935. J. c. KARNES TELESCOPICSIGHT FOR GUNS Filed Oct. 9, 1934 2 Sheets-Sheet 2 Inventor lmlmll 742$1 Llamas G-Karnas Ely Attmrne lllo M ENTS.

Patented Oct. 15, 1935 UNITED STATES PATENT OFFICE Application October9,

5 Claims.

1934, Serial No. 747,556

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. 757) The invention described hereinmay be manufactured and used by or for the Government for governmentalpurposes, without the payment to me of any royalty thereon.

This invention relates to a telescopic sight for guns.

The purpose of the invention is to provide a telescopic sight for gunsin which range or elevation is applied bymoving a reticle and in whichcorrection for drift is applied by moving the reticle on an incline withrespect to the vertical plane of the axis of bore of the telescope orgun.

A further object of the invention is to arrange the sight so that it maybe used with either one of two guns having different characteristics.

With the foregoing and other objects in View, the invention resides inthe novel arrangement and combination of parts and. in the details ofconstruction hereinafter described and claimed, it being understood thatchanges in the precise embodiment of the invention herein disclosed maybe made within the scope of what is claimed without departing from thespirit of the invention.

A practical embodiment of the invention is illustrated in theaccompanying drawings, wherein:

Fig. 1 is a plan view of a telescopic sight constructed in accordancewith the invention.

Fig. 2 is a view in side elevation.

Fig. 3 is a sectional view on the line 33 of Fig. 1.

Fig. 4 is a sectional view on the line 4-4 of Fig. 2.

Fig. 5 is a view in side elevation of the range drums.

Fig. 6 is a sectional view on the line 6-6 of Fig. 1.

Referring to the drawings by characters of reference, there is shown atelescope formed of the usual tube 5 adapted to be mounted in a frontbracket 6 and a rear bracket 1 attached to the gun 8. A collar 9 on thetube 5 has a rounded surface engaging the front bracket 6 whereby thetube is capable of pivotal movement. A collar II] on the tube is heldagainst the inturned flange I I of the rear bracket 1 by means of a ringI2 encircling and spaced from the tube and threaded into the rear partof the bracket.

The collar ID has a plurality of plane surfaces I3-I3 preferably four innumber, each surface being engaged by a screw I4 threaded in the rearbracket 1. The screws l4 support the rear end of the tube 5 and enableit to be displaced about the front bracket as a pivot to position theaxis of the tube 5 parallel to the axis of bore of the barrel of thegun.

The rear or eye-piece portion of the tube (Fig. 3) is formed of twoparts I5 and I6 held together by screws I l and cooperating to provide achamber I8. Within the chamber there is a frame I9 carrying atransparent plate 20 etched with a reticle 2|. The frame is mounted forvertical sliding movement at a slight incline to the true vertical axisof the tube 5, the purpose of the incline being to enter a correctiondue to drift as will be described more fully hereinafter.

One side of the frame I9 is slidably fitted in a groove 22 formed in theparts l5 and I6 of the tube. The opposite side of the frame is provided15 with a guide ring 23 and a nut 24, the former embracing a smooth partof a shaft 25 and the latter engaging a threaded part 26 of the shaft.The shaft 25 is arranged at a slight incline to the vertical axis of thetube 5. A nut 21 on the 20 threaded part 26 of the shaft has one face 28hearing against the frame whereby it is held against rotation with theshaft and. is constrained to be translated with the frame when the shaftis rotated. A helical spring 29 embracing the 5 shaft and confinedbetween the nut 21 and the guide ring 23 serves to eliminate playbetween the nut 24 and the threads 26 of the shaft.

When the intersection of the vertical and horizontal lines of thereticle is on the optical axis 0 of the telescope and corresponds tozero elevation, the reticle bears a predetermined positional relationwith reference to the plane surfaces I3 of the collar I0 and also withreference to the axis of the elevating shaft 25 as clearly shown 35 inFig. 6. The inclination of the shaft with respect to the true verticalaxis of the tube 5 which corresponds to the zero position of the reticleshown in Fig. 6 is obtained by plotting angular elevation due to rangeagainst drift in mils.

The shaft 25 projects from the upper and also from the lower side of thetube and is held against axial displacement by means of collars 30, oneof which is mounted on each projecting end of the shaft and secured by apin 3|. A 45 drum 32, carried by the lower collar and clamped thereon bya disk 33 which is held on the collar by a screw 34, is inscribed with arange scale 35 for a .50 caliber gun. The range scale is readableagainst a reference mark 36 on the por- 50 tion I5-| 6 of tube 5.

A drum 3! carried by the upper collar and similarly retained by a disk38 and screw 39, is inscribed with a range scale 40 for a .30 calibergun, which scale is readable against a reference mark 4|. The disk 38 isformed with an annular flange 42 whereby it constitutes a hand wheel forrotating the shaft 25.

In Fig. 4 the reticle is shown in a position corresponding to zeroelevation. When the shaft 25 is rotated to apply range the reticle islowered or raised depending on the type of lens system in the telescope,the point of intersection of the reticle moving along a line which isparallel to the inclined axis of the shaft and which diverges from thetrue vertical axis of the tube 5 by an amount to correct the line ofsight for lateral deviation due to drift.

I claim.

1. In a telescopic sight, a tube having a chamber, a shaft passingthrough the tube and chamber at a slight incline to the vertical axis ofthe tube and having a threaded portion, a frame having a guide ring onthe shaft and having a nut on the threaded portion of the shaft, meansfor guiding the opposite side of the frame, a nut on the threadedportion of the shaft and held against rotation by the frame, a springbetween said nut and the guide ring, anieticle carried by for guidingthe opposite side of the frame, a reticle carried by the frame, a drumon one end of the shaft having a range scale for one calibre of gund, adrum on the other end of the shaft having a range scale for a differentcalibre of gun.

3. In a telescopic sight, a tube having a chamber, a shaft passingthrough the tube and chamber at a slight incline to the vertical axis ofthe tube and having a threaded portion, a frame having a guide ring onthe shaft and having a nut on the threaded portion of the shaft, meansfor guiding the opposite side of the frame, a reticle carried by theframe, and a drum on one end of the shaft having a range scale.

4. In a telescopic sight, a tube, a shaft rotatably carried by the tubeand arranged at a slight inclination to the vertical axis of the tube,range .drums for two calibres of guns carried by the shaft, a framewithin the tube and movable by 20 the shaft, a reticle carried by theframe and means including the shaft for mounting the frame for slidingmovement at an inclination to the vertical axis of the tube.

5. In a telescopic sight, a tube, a shaft rotat- 25

